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The superfamily Cercopoidea is commonly named as “spittlebugs”, as its nymphs produce a spittle mass to protect themselves. Cosmoscartini (Cercopoidea: Cercopidae) is a large and brightly colored Old World tropical tribe, including 11 genera. A new genus <i>Nangamostethos</i> gen. nov. (type species: <i>Nangamostethos</i><i>tibetense</i> sp. nov.) of Cosmoscartini is described from Niubao Formation, the late Eocene of central Tibetan Plateau (TP), China. Its placement is ensured by comparison with all the extant genera of the tribe Cosmoscartini. The new fossil represents one of few fossil Cercopidae species described from Asia. It is likely that <i>Nangamostethos</i> was extinct from the TP due to the regional aridification and an overturn of plant taxa in the late Paleogene.